Don't teach a day to do nothing: don't let a day pass.
Qi Baishi's story:
Qi Baishi, a master of Chinese painting, still keeps writing every day in his nineties. At least five a day, he wrote six big characters "Don't teach a day" and hung them on the wall to encourage himself.
One day, the old man Baishi celebrated his birthday. People poured in from morning till night to celebrate his birthday. It was already late at night when he sent the guests away. After a busy day, he felt very tired and went to bed.
The next day, Qi Baishi got up early in the morning and went to the studio to paint, regardless of eating. His family advised him to paint after dinner, but he insisted on painting five pictures before eating breakfast.
After dinner, he went to the studio to paint. His family was afraid that he was tired and advised him, "Didn't you just draw five?" How to draw? He replied, "I couldn't draw yesterday because of my birthday." I will paint more today to make up for my leisure yesterday. "